What's healthy to eat with gestational diabetes?

I was just diagnosed with diabetes and I am 7 weeks pregnant. Obviously, I'm supposed to avoid sugary treats--but the doctor acted like starchy foods would raise my blood sugar too. I really want to make sure my blood sugar is stabilized for my baby's health. So, if you know, what are specific diabetic-friendly foods, and what are foods (other than the obvious sweets) that I should steer clear of? Thanks for any advice!